Roll WebGL 87aaf44..9422979

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/87aaf44..9422979

BUG=
TBR=kbr@chromium.org
TEST=bots

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2903503002
Cr-Commit-Position: refs/heads/master@{#473812}

DEPS

@@ -196,7 +196,7 @@ deps = {
     Var('chromium_git') + '/external/bidichecker/lib.git' + '@' + '97f2aa645b74c28c57eca56992235c79850fa9e0',
 
   'src/third_party/webgl/src':
-    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '87aaf44c5333e8b209baf5e11baa325b79ddeb62',
+    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '9422979e2a13b6d80de866a271a34653998d4c85',
 
   'src/third_party/webdriver/pylib':
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',

content/test/gpu/gpu_tests/webgl_conformance_revision.txt

 # AUTOGENERATED FILE - DO NOT EDIT
 # SEE roll_webgl_conformance.py
-Current webgl revision 87aaf44c5333e8b209baf5e11baa325b79ddeb62
+Current webgl revision 9422979e2a13b6d80de866a271a34653998d4c85